A week earlier, the family of Cole Miller had gathered around their adored youngest member's hospital bed and watched him slip away.

On Monday, as they continued to struggle with trying to make sense of the nonsensical, the Miller family remain people in extraordinary pain.

Well-wishers greet Cole Miller's brother Billy.

Photo: Drew Creighton

"Cole was the little one in the family, everyone absolutely loved and adored him," his older brother Billy told the crowds who gathered at King George Square to mourn him on Monday.

"We all had a unique but special bond with Cole. Cole brought joy to all our lives."

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The gathering served as both a memorial and rally for Cole Miller, a week after he died.

Photo: Kim Stephens

Like most of the mourners who attended Monday's public rally, Cole's father Steve and brothers Mitch and Billy were clad in green, the colour of Cole's water polo team, the Brisbane Barracudas.

Cole's mother Mary-Leigh and sister Kate did not attend the gathering.

Each of Cole's father and brothers, at various times through the short service, let their tears flow.

As MC Wally Lewis began addressing the crowd, Steve Miller sat in the front row struggling to keep his composure.

Well-wishers greet Cole Miller's father Steve at the a memorial.

Photo: Drew Creighton

Sitting beside him, Mitch put his arm around him, where it stayed, until it was Steve's turn to support Billy, standing behind him on stage as the member of the 2012 Australian Olympic water polo team bravely paid tribute to his "quiet, humble but very driven" brother, whose life was cruelly snatched away just as it was his "time to shine".

Cole, 18, graduated from Brisbane State High School last year and had achieved a Queensland Academy of Sport scholarship when he died.

Wally Lewis MCs the memorial for alleged one-punch victim Cole Miller, a week after he died.

Photo: Kim Stephens

He scored his first goal as a member of the Australian under 18 water polo team just a few weeks ago, Mr Lewis told the crowd who gathered in King George Square.

"All the boys spoke about how hard it would be to take that smile away," he said.

Members of the Veterans Motorcycle Club attended the memorial to Cole Miller, to take a stand against street violence.

Photo: Kim Stephens

"He was at the beginning of what should have been a very long and distinguished career."

Cole had been out in Fortitude Valley's nightclub precinct during a break in training in the early hours of Sunday, January 3 when he walked through Chinatown Mall with a friend on the way to a taxi rank and allegedly into the path of Armstrong Renata and Daniel Maxwell, both 21.

Sunshine Coast school friends of Cole's including a tearful Cheyenne Lyons, left, attended his memorial at King George Square.

Photo: Kim Stephens

The pair allegedly picked a fight with the teenager, and, in an unprovoked attack, Mr Renata allegedly delivered a ferocious single blow to Cole's head that caused massive head injuries from which he would never wake.

Both Mr Renata and Mr Maxwell are in custody, charged with unlawful striking causing death.

Two days before his family will bid their final goodbyes to their much-loved youngest member at a service in Brisbane's CBD on Wednesday, Billy Miller called for an end to the senseless street violence that allegedly claimed the life of his brother.

"Sadly, our family is not alone in losing a loved one in tragic circumstances," he said.

"We should not have to worry about a loved one going out and having a good time with friends.

"We should, as a society, be educated enough to understand the difference between right and wrong.

"It is time for love and truth and action."

It was a sentiment echoed by Mr Lewis, which drew applause from the crowd, many of whom were sporting black wristbands

"It has to stop. It must stop and we demand it does right now," he said.

"We've had enough. It's not fair. It's not right and it's not going to continue."

While the formalities of the memorial lasted just 15 minutes, it took another 20 minutes for Steve, Billy and Mitch Miller to make the 20 metre walk to the entrance of City Hall, as many green-clad well-wishers, a number fo them strangers, flocked to the trio to hug them and offer their condolences.

The eclectic crowd of mourners included a large contingent of Brisbane Barracudas members, school friends of Cole's, along with many who had never met the teenager but who had been shocked by his death.

Among the more surprising members were about 10 members of the Veterans Motorcycle Club from across Southeast Queensland.

Sunshine Coast club member Daniel Kelly who knew the Miller family from their time living in the area said in addition to supporting the family, it was important that the club took a stand against street violence.

"Bikies might always have violence against each other but they don't hold with violence against kids or women and if they do, there's none of this king-hitting or anything like that," said.

"We wanted to stand up against this violence, it's senseless, you know?"

"I mean we've had our bit of violence in our time but we don't want to see this sort of stuff in the streets with our children as well."

A tearful Cheyenne Lyons also travelled from the Sunshine Coast with two school friends, all of whom went attended junior school with the slain teenager before he left for Brisbane.

Ms Lyons kept in touch with her school friend and last saw him at November's schoolies celebration on the Gold Coast.

"You hear about it on the news but you don't expect it to happen to someone you know," she said.

"He was the loveliest guy, so funny and just so caring.

"He was always really loving and obviously everyone's here in support of him."

On behalf of his family, Billy Miller thanked the crowd for the outpouring of support that had followed his death.

"Our family is overwhelmed by the massive amount of support and love we have received from friends near and far," he said.

"It is amazing how people have reached out to us with sympathy, love and hope."

Cole Miller's family will farewell him at a funeral service at St Stephen's Cathedral on Wednesday morning.